Hole density dependence of the low temperature electronic specific heat coefficient of La2-xSrxCaCu2O6 with weakly localized electrons

Takashi Nishikawa, Shin ichi Shamoto, Masafumi Sera, Masatoshi Sato, Shigeki Ohsugi, Yoshio Kitaoka, Kunisuke Asayama

研究成果: Article同行評審

36 引文 斯高帕斯(Scopus)

摘要

La2-xSrxCaCu2O6 samples were prepared at 1050°C under 20 atm oxygen pressure. By various kinds of measurements, it was found that their superconducting volume fractions were very small due to the presence of weak electron localization caused by oxygen deficiency. Then, the electronic specific heat coefficient γ could be determined from the specific heat data measured at low temperature, considering that weak localization does not significantly affect the γ values. The results show that as the hole carrier density of the high-Tc Cu oxide system decreases or the system approaches the metal-insulator boundary from the metallic side, γ decreases in contrast to the cases of other Mott-Hubbard systems.

原文English
頁(從 - 到)553-558
頁數6
期刊Physica C: Superconductivity and its applications
209
發行號4
DOIs
出版狀態Published - 1993 5月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程

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